VersionPress\Tests\Utils\TestRunnerOptions::getInstance PHP Method

    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new TestRunnerOptions();
        }
        return self::$instance;
    }

 public static function setUpBeforeClass()
 {
     self::setUpSite(TestRunnerOptions::getInstance()->forceSetup == "before-class");
 }